<?php
/**
 * Zend Framework
 *
 * LICENSE
 *
 * This source file is subject to the new BSD license that is bundled
 * with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://framework.zend.com/license/new-bsd
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@zend.com so we can send you a copy immediately.
 *
 * @category   Zend
 * @package    Zend_Filter
 * @copyright  Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 * @version    $Id: Compress.php 23775 2011-03-01 17:25:24Z ralph $
 */

/**
 * @see Zend_Filter_Interface
 */
require_once 'Zend/Filter/Interface.php';

/**
 * Compresses a given string
 *
 * @category   Zend
 * @package    Zend_Filter
 * @copyright  Copyright (c) 2005-2011 Zend Technologies USA Inc. (http://www.zend.com)
 * @license    http://framework.zend.com/license/new-bsd     New BSD License
 */
class Zend_Filter_Compress implements Zend_Filter_Interface {
	/**
	 * Compression adapter
	 */
	protected $_adapter = 'Gz';
	
	/**
	 * Compression adapter constructor options
	 */
	protected $_adapterOptions = array ();
	
	/**
	 * Class constructor
	 *
	 * @param string|array $options (Optional) Options to set
	 */
	public function __construct($options = null) {
		if ($options instanceof Zend_Config) {
			$options = $options->toArray ();
		}
		if (is_string ( $options )) {
			$this->setAdapter ( $options );
		} elseif ($options instanceof Zend_Filter_Compress_CompressInterface) {
			$this->setAdapter ( $options );
		} elseif (is_array ( $options )) {
			$this->setOptions ( $options );
		}
	}
	
	/**
	 * Set filter setate
	 *
	 * @param  array $options
	 * @return Zend_Filter_Compress
	 */
	public function setOptions(array $options) {
		foreach ( $options as $key => $value ) {
			if ($key == 'options') {
				$key = 'adapterOptions';
			}
			$method = 'set' . ucfirst ( $key );
			if (method_exists ( $this, $method )) {
				$this->$method ( $value );
			}
		}
		return $this;
	}
	
	/**
	 * Returns the current adapter, instantiating it if necessary
	 *
	 * @return string
	 */
	public function getAdapter() {
		if ($this->_adapter instanceof Zend_Filter_Compress_CompressInterface) {
			return $this->_adapter;
		}
		
		$adapter = $this->_adapter;
		$options = $this->getAdapterOptions ();
		if (! class_exists ( $adapter )) {
			require_once 'Zend/Loader.php';
			if (Zend_Loader::isReadable ( 'Zend/Filter/Compress/' . ucfirst ( $adapter ) . '.php' )) {
				$adapter = 'Zend_Filter_Compress_' . ucfirst ( $adapter );
			}
			Zend_Loader::loadClass ( $adapter );
		}
		
		$this->_adapter = new $adapter ( $options );
		if (! $this->_adapter instanceof Zend_Filter_Compress_CompressInterface) {
			require_once 'Zend/Filter/Exception.php';
			throw new Zend_Filter_Exception ( "Compression adapter '" . $adapter . "' does not implement Zend_Filter_Compress_CompressInterface" );
		}
		return $this->_adapter;
	}
	
	/**
	 * Retrieve adapter name
	 *
	 * @return string
	 */
	public function getAdapterName() {
		return $this->getAdapter ()->toString ();
	}
	
	/**
	 * Sets compression adapter
	 *
	 * @param  string|Zend_Filter_Compress_CompressInterface $adapter Adapter to use
	 * @return Zend_Filter_Compress
	 */
	public function setAdapter($adapter) {
		if ($adapter instanceof Zend_Filter_Compress_CompressInterface) {
			$this->_adapter = $adapter;
			return $this;
		}
		if (! is_string ( $adapter )) {
			require_once 'Zend/Filter/Exception.php';
			throw new Zend_Filter_Exception ( 'Invalid adapter provided; must be string or instance of Zend_Filter_Compress_CompressInterface' );
		}
		$this->_adapter = $adapter;
		
		return $this;
	}
	
	/**
	 * Retrieve adapter options
	 *
	 * @return array
	 */
	public function getAdapterOptions() {
		return $this->_adapterOptions;
	}
	
	/**
	 * Set adapter options
	 *
	 * @param  array $options
	 * @return void
	 */
	public function setAdapterOptions(array $options) {
		$this->_adapterOptions = $options;
		return $this;
	}
	
	/**
	 * Calls adapter methods
	 *
	 * @param string       $method  Method to call
	 * @param string|array $options Options for this method
	 */
	public function __call($method, $options) {
		$adapter = $this->getAdapter ();
		if (! method_exists ( $adapter, $method )) {
			require_once 'Zend/Filter/Exception.php';
			throw new Zend_Filter_Exception ( "Unknown method '{$method}'" );
		}
		
		return call_user_func_array ( array ($adapter, $method ), $options );
	}
	
	/**
	 * Defined by Zend_Filter_Interface
	 *
	 * Compresses the content $value with the defined settings
	 *
	 * @param  string $value Content to compress
	 * @return string The compressed content
	 */
	public function filter($value) {
		return $this->getAdapter ()->compress ( $value );
	}
}
